Acid-activated bentonite (Maghnite-\(\hbox {H}^{+})\) as a novel catalyst for the polymerization of decamethylcyclopentasiloxane

  • Djamal Eddine Kherroub
  • Mohammed Belbachir
  • Saad Lamouri
  • Karim Chikh


In this study, we propose Maghnite-\(\hbox {H}^{+}\), as an ecological, cost-effective and easily renewable catalyst, for the polymerization of decamethylcyclopentasiloxane (D5). The Maghnite is a clay consisting primarily of smectite minerals (montmorillonite group), which can be activated/reactivated through a simple process, by replacing interlayer cations by protons. Linear polymers with higher molecular mass and narrower molecular mass distribution (MMD) can be obtained with less cyclic by-products, using Maghnite-\(\hbox {H}^{+}\). The reaction was investigated in bulk, taking into account the effect of time, temperature and amount of catalyst on the monomer conversion and MMD. When the yield rises to 96%, the MMD is broadened, suggesting the formation of cyclic oligomers and/or crosslinking bonds, this was confirmed experimentally by infra-red spectroscopy, proton nuclear magnetic resonance (\(^{1}\hbox {H}\) NMR) and \(^{13}\hbox {C}\) NMR analyses. The kinetics have been also studied; the reaction is first order in the monomer. The proposed reaction mechanism shows clearly the role of Maghnite-\(\hbox {H}^{+}\) for D5 polymerization.


Catalyst maghnite-\(\hbox {H}^{+}\) bentonite decamethylcyclopentasiloxane ring opening polymerization 


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • Djamal Eddine Kherroub
    • 1
    • 2
  • Mohammed Belbachir
    • 1
  • Saad Lamouri
    • 3
  • Karim Chikh
    • 1
  1. 1.Laboratory of Polymer Chemistry, Department of Chemistry, Faculty of Exact and Applied SciencesUniversity of Oran, 1 Ahmed Ben BellaEl’Menouer OranAlgeria
  2. 2.Institute of Sciences and TechnologyUniversity Centre of Relizane Ahmed ZabanaRelizaneAlgeria
  3. 3.Laboratory of Macromolecular ChemistryPolytechnic Military School (EMP)Bordj El BahriAlgeria

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